What's a kilowatt?
A kilowatt, or kW for short, is a unit of power that measures the rate of energy conversion. The average annual electrical energy consumption of a household in the United States is about 8,900 kilowatt-hours.

"Watt" does this mean for the environment?Every year, a 10 kW solar or wind system is reducing greenhouse gas emissions significantly. That’s like eliminating 953 gallons of gasoline, or recycling 2.9 tons of waste instead of sending it to a landfill.